Congenital wilson&;s disease is characterized by
**Core Concept**
Wilson's disease is a rare genetic disorder caused by a defect in the ATP7B gene, leading to an accumulation of copper in the body, particularly in the liver, brain, and other organs. This accumulation causes oxidative stress and damage to cells, resulting in various clinical manifestations.
**Why the Correct Answer is Right**
The correct answer is related to the pathophysiology of Wilson's disease, where the accumulation of copper is a key factor. The ATP7B gene plays a crucial role in regulating copper transport and metabolism in the liver. In Wilson's disease, mutations in the ATP7B gene lead to an impaired ability to export copper from the liver, resulting in its accumulation and subsequent toxicity. This is due to the impaired function of the copper-transporting ATPase, which is encoded by the ATP7B gene.
**Why Each Wrong Option is Incorrect**
**Option A:** Accumulation of iron is incorrect because Wilson's disease is associated with copper accumulation, not iron.
**Option B:** Deficiency of vitamin B12 is incorrect because Wilson's disease is not related to vitamin B12 metabolism or deficiency.
**Option C:** Mutation in the HFE gene is incorrect because the HFE gene is associated with hereditary hemochromatosis, a different condition characterized by iron overload.
**Clinical Pearl / High-Yield Fact**
Wilson's disease is often referred to as "hepatolenticular degeneration" due to its effects on the liver and the brain. It's essential to remember that Wilson's disease can present with a wide range of symptoms, including liver disease, neurological symptoms, and psychiatric problems.
**Correct Answer:** A. Accumulation of copper.